Abstract Structural properties of RMn2 hydrides (R = Y, Gd or Dy) have been studied by means of powder X-ray diffraction (XRD) at 300 K and extended X-rayabsorption fine structure (EXAFS) at 300 K and low temperatures. It was found that at 300 K the lattice parameters increase continuously upon hydrogen absorption (except for DyMn2Hx with x R 3 m ). For the hydrogen concentration range 3.5
摘要 利用粉末 X 射线衍射 (XRD) 在 300 K 和扩展 X 射线吸收精细结构 (EXAFS) 在 300 K 和低温下研究了 RMn2 氢化物(R = Y、Gd 或 Dy)的结构特性。发现在 300 K 时,吸氢后晶格参数不断增加(DyMn2Hx 除外,x R 3 m )。对于氢气浓度范围 3.5
Magnetic and structural investigations of GdMn2-GdNi2 intermetallic compounds
作者:A. Ślebarski、P. Byszewski
DOI:10.1016/0304-8853(82)90270-0
日期:1982.5
Magnetic and structural properties of the intermetallic system Gd(Mn1-xNix)2 were investigated. The 0⩽x⩽0.4 and 0.7
The magnetic phase diagram and the effect of pressure on the magnetic properties of the intermetallic compounds
作者:I S Dubenko、I Yu Gaidukova、Y Hosokoshi、K Inoue、A S Markosyan
DOI:10.1088/0953-8984/11/14/010
日期:1999.4.12
The magnetization up to 50 kOe, the magnetic susceptibility under external pressure up to 5 kbar and the thermal expansion of the cubic Laves phase compounds were studied over a wide temperature range. Two well defined concentration regions were isolated in the x-T phasediagram: , in which the antiferromagnetic structure is primarily determined by the d-d interaction (-type), and , in which the f-d
在很宽的温度范围内研究了高达 50 kOe 的磁化强度、高达 5 kbar 的外部压力下的磁化率和立方 Laves 相化合物的热膨胀。在 xT 相图中隔离了两个明确定义的浓度区域:其中反铁磁结构主要由 dd 相互作用(-型)决定,并且其中 fd 相互作用起主导作用(-型)。得出的结论是 Gd 和 Mn 亚晶格都在下面排序,40 K 时磁特性的变化被解释为反铁磁性 - 非共线亚铁磁性转变。中间化合物在低温下表现出短程有序特征的冻结和时间依赖性行为。
Pressure-induced decoupling of the magnetic ordering of the Mn and Gd sublattices in
effect, caused by the onset of the Mn magnetism, is found to be shifted towards lower temperatures with pressure, and vanishes around 15 kbar. Above this pressure only the Gdsublattice shows long-range magneticorder. Between 6 and 15 kbar the Gd and Mnsublatticesorder separately. The pressure-induced splitting of the ordering temperatures is ascribed to the Mn magnetism instability, which is observed
热膨胀是在高达 20 kbar 的压力下测量的。发现由 Mn 磁性的开始引起的大正磁体积效应随着压力向较低温度移动,并在 15 kbar 附近消失。在这个压力之上,只有 Gd 亚晶格显示出长程磁序。在 6 到 15 kbar 之间,Gd 和 Mn 子晶格分别排序。有序温度的压力诱导分裂归因于 Mn 磁性不稳定性,这在某些化合物中观察到。
X-Ray Study of Crystal Distortions in RMn<sub>2</sub>Compounds (R: Y, Pr, Nd, Sm and Gd)